Hero Has Returned

In the wake of saving one world, fighter Minsu Kim gets back to Earth just to track down that he's lost everything... so he chooses to annihilate the world he used to call home. In his frenzy, he kills youngster Jeongsu Park and his loved ones. However, rather than passing on regularly, Jeongsu is shipped to a different universe, where he tracks down that he's presently a fighter himself. Subsequent to killing the devil ruler of this substitute world and leveling up his abilities as a fighter, Jeongsu gets back to earth, never going to budge on retribution against Minsu. As the two heroes battle with the destiny of their country yet to be determined, who will arise triumphant?